The phrase "not different peep" means that nothing seems to have changed or there is no variation in something. There are several synonyms that can be used to express this idea, such as "nothing new under the sun," "the same old thing," "unchanged," "unvarying," "stagnant," "static," "unmoved," "unaltered," "uniform," "constant," "invariant," "steady," and "unchanging." These synonyms can be used interchangeably based on the context and nature of the situation. They all imply that nothing has changed or deviated from the norm, suggesting monotony or lack of excitement. Therefore, it is important to choose the right synonym that accurately describes the situation.